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London - The engine shutdown of an Iberia A350-900 on September 11 during the flight from New York to Madrid raised concerns that the incident might occur due to a design failure on the Rolls-Royce Trent XWB, Bloomberg news agency reports.

Iberia flight 6252, which took off from John F. Kennedy International Airport around 21.00 local, had to make an emergency landing at Logan International Airport in Boston 90 minutes after the take-off. The flight crew reported that one of the engines lost power on the flight.

Although the Trent XWB engine is exclusive to the Airbus A350, the incident reminded the problem with the Trent 1000 model of the manufacturer that grounded many Boeing 787s of the airline operators around the world.

The design of the Trent XWB depends on a different architecture, Rolls-Royce had announced before, and shouldn't be affected by the same flaws as Trent 1000.

We are aware of the issue and will be working closely with the airline to support them,

Rolls-Royce told Bloomberg after the flight 6252 incident.

The engineers are working to find the cause of the failure, the British engine manufacturer also said.

Rolls-Royce shares fell as much as 4.7 percent at London Stock Market in a day. This is the most significant daily drop since July 31 last year.